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Help replacing 2 gang light switch please

Discussion in 'Electrics UK' started by Pbcolley, 19 Feb 2019.

  1. Pbcolley

    Pbcolley

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    I want to change my old light switch with a new one anyone advise on correct wiring
    See pictures, the connections on the right as you look at it work the downstairs light if that helps
    Thanks in advance
     
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  3. ericmark

    ericmark

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    Common is L1 (red with link wire)
    L1 becomes L2 (Black wire)
    L2 becomes L3 (extra red wire)
    However it does not make sense, you have the two commons linked on the old switch, normally line feed goes to common on an off/on switch and L1 with a two way switch, and one switch seems to be off/on and the other two way. So question is does the two way switch work correctly now. There are more than one way to wire so may be correct, but check first.
     
  4. FrodoOne

    FrodoOne

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    The connections on the "new" switches marked "L1" are equivalent to the connections on the old switches marked "Common". The incoming Red wires should be connected to these terminals.
    Both the old and new switch pairs are each Single Pole Double Throw (SPDT)
    Your new pair of switches have the connections of one switch upside down - as compared to the other, and to the old switches.
    The original pair has a multiway switch on the left with two outgoing wires connected. [There is at least one other switch controlling the light(s) on this circuit.]
    The switch on the right has a single outgoing connection, which should be connected to L2 on the new switch.

    Does one really need to explain any more?
     
  5. Pbcolley

    Pbcolley

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    The switch works fine it controls the landing and hall lights.
    The connections at the top are both labelled 2 way and common was that normal on older switches ?
     
  6. EFLImpudence

    EFLImpudence

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    It means it is a 2-way switch and the terminal is labelled 'common' - admittedly confusing.

    There is no 'normal'. Different makes are marked differently.

    Just remember each switch is a triangle with one terminal at one end and two at the other.
     
  7. ban-all-sheds

    ban-all-sheds

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    That link is pretty normal (or used to be) with hall/landing light switching.

    upload_2019-2-19_17-57-43.png

    It's why you end up with borrowed neutrals when splitting the up & down circuits.
     
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